JPS62217477A - Slider for head current detection - Google Patents
Slider for head current detectionInfo
- Publication number
- JPS62217477A JPS62217477A JP5968686A JP5968686A JPS62217477A JP S62217477 A JPS62217477 A JP S62217477A JP 5968686 A JP5968686 A JP 5968686A JP 5968686 A JP5968686 A JP 5968686A JP S62217477 A JPS62217477 A JP S62217477A
- Authority
- JP
- Japan
- Prior art keywords
- slider
- disk medium
- magnetic disk
- piezoelectric
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 230000002159 abnormal effect Effects 0.000 claims abstract description 5
- 239000011810 insulating material Substances 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 239000012212 insulator Substances 0.000 abstract 2
- 230000005856 abnormality Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
本発明は磁気ディスク媒体上の微小突起等の表面異常を
、該媒体の回転状態で検出するヘッドタッチ検出用スラ
イダにおいて、主体となる浮動形へラドスライダ上に、
該スライダと回転中の磁気ディスク媒体との異常接触時
の振動振幅を検出する圧電検出素子を絶縁材を介して片
持ち状に付設して、該圧電検出素子自身も振動する構造
とすることにより、検出感度を高め、磁気ディスク媒体
上の微小突起の存在の検出は勿論のこと、該微小突起の
数や大きさも正確に検出し得るようにしたものである。[Detailed Description of the Invention] [Summary] The present invention relates to a head touch detection slider that detects surface abnormalities such as minute protrusions on a magnetic disk medium while the medium is rotating. To,
By attaching a piezoelectric detection element in a cantilevered manner through an insulating material to detect vibration amplitude at the time of abnormal contact between the slider and a rotating magnetic disk medium, the piezoelectric detection element itself also vibrates. , the detection sensitivity is increased so that not only the presence of minute protrusions on a magnetic disk medium can be detected, but also the number and size of the minute protrusions can be accurately detected.
（産業上の利用分野〕
本発明は磁気ディスク媒体上の微小突起等の表面異常を
、該媒体の回転状態で検出するヘッドタッチ検出用スラ
イダに係り、特に検出素子の付設構成を改良して、その
検出感度の向上を図った構造に関するものである。(Industrial Application Field) The present invention relates to a head touch detection slider for detecting surface abnormalities such as minute protrusions on a magnetic disk medium while the medium is rotating. The present invention relates to a structure designed to improve detection sensitivity.
磁気ディスク媒体の表面に発生する微小突起等の表面異
常を検出する装置としては、単に微小突起の存在を検出
するのみでなく、その数や大きさも正確に検出ことが必
要であり、このため検出感度の向上が要望されている。A device that detects surface abnormalities such as microprotrusions that occur on the surface of magnetic disk media must not only detect the presence of microprotrusions, but also accurately detect their number and size. There is a demand for improved sensitivity.
従来のヘッドタッチ検出用スライダは第２図に示すよう
に、浮動形へラドスライダ１１の上面に圧電素子等の超
音波検出素子１２が直接、または絶縁材を介して付設さ
れている。そして回転中の磁気ディスク媒体上の微小突
起に該ヘッドスライダ１１が接触した際に発生する振動
波を、該ヘッドスライダ１１自身を介して前記超音波検
出素子１２に伝播させて検出している。As shown in FIG. 2, a conventional head touch detection slider has an ultrasonic detection element 12 such as a piezoelectric element attached to the upper surface of a floating RAD slider 11 either directly or via an insulating material. Vibration waves generated when the head slider 11 comes into contact with minute protrusions on the rotating magnetic disk medium are transmitted to the ultrasonic detection element 12 via the head slider 11 itself and detected.
しかし、このような検出構成においては、前記ヘッドス
ライダ１１身を介して前記超音波検出素子２に伝播され
る振動波が微弱であるため、感度のよい検出ができず、
微小突起の存在を検出する程度で、その数、大きさ等を
正確に検出することができないという問題があった。However, in such a detection configuration, since the vibration waves propagated to the ultrasonic detection element 2 through the head slider 11 are weak, sensitive detection cannot be performed.
There has been a problem in that it is only possible to detect the presence of microprotrusions, but it is not possible to accurately detect their number, size, etc.
本発明はこのような従来の欠点に鑑み、浮動形ヘッドス
ライダの上面に付設する圧電検出素子の取付は構造を改
良して、検出感度の向上を図り、磁気ディスク媒体上の
微小突起の数や大きさを正確に検出し得る新規なヘッド
タッチ検出用スライダを提供することを目的とするもの
である。In view of these conventional drawbacks, the present invention improves the structure of the piezoelectric detection element attached to the top surface of the floating head slider, improves detection sensitivity, and reduces the number of microprotrusions on the magnetic disk medium. It is an object of the present invention to provide a novel head touch detection slider that can accurately detect the size.
本発明は上記目的を達成するため、浮動形へラドスライ
ダ上に、該スライダと回転中の磁気ディスク媒体の異常
接触を検出する圧電検出素子を絶縁材を介して片持ち状
に付設し、該圧電検出素子自身も振動し易くして検出感
度を高めた構造とする。In order to achieve the above object, the present invention includes a piezoelectric detection element cantilevered through an insulating material on a floating RAD slider to detect abnormal contact between the slider and a rotating magnetic disk medium. The detection element itself also has a structure that makes it easy to vibrate to increase detection sensitivity.
本発明のヘッドタッチ検出用スライダは、浮動形ヘッド
スライダ上に圧電検出素子を絶縁材を介して片持ち状に
付設されているため、当該ヘッドタッチ検出用スライダ
が回転中の磁気ディスク媒体の微小突起に接触した場合
、該ヘッドスライダが急激な加速度を受ける。この時、
片持ち状に付設されている圧電素子も振動し、従来より
も大きな異常信号出力が発生され、検出感度を高めるこ
とができる。In the head touch detection slider of the present invention, the piezoelectric detection element is cantilevered on the floating head slider through an insulating material, so that the head touch detection slider can be used to detect minute vibrations of the rotating magnetic disk medium. When the head slider comes into contact with the protrusion, the head slider is subjected to rapid acceleration. At this time,
The piezoelectric element attached in a cantilevered manner also vibrates, generating a larger abnormal signal output than in the past, thereby increasing detection sensitivity.
以下図面を用いて本発明の実施例について詳細に説明す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係るヘッドタッチ検出用スライダの一
実施例を示す概略側面図である。FIG. 1 is a schematic side view showing an embodiment of a head touch detection slider according to the present invention.
図において、１１は浮動形へラドスライダであり、該ヘ
ッドスライダ１１上に絶縁材２１を介して圧電検出素子
１２が片持ち状に接合配置されている。In the figure, reference numeral 11 denotes a floating head slider, and a piezoelectric detection element 12 is cantilevered and arranged on the head slider 11 with an insulating material 21 interposed therebetween.
そしてこのような構造のヘッドタッチ検出用スライダを
用いて回転中の磁気ディスク媒体表面の微小突起を検出
する場合、例えば磁気ディスク媒体上の微小突起に該浮
動形ヘッドスライダ１１が接触して急激な衝撃力が加わ
ると前記圧電検出素子１２は片持ち状であるがために、
その共振点で大きく振動する。When detecting minute protrusions on the surface of a rotating magnetic disk medium using a head touch detection slider with such a structure, for example, if the floating head slider 11 comes into contact with a minute protrusion on the magnetic disk medium and suddenly When an impact force is applied, since the piezoelectric detection element 12 is in a cantilevered shape,
It vibrates strongly at its resonance point.
この振幅は浮動形ヘッドスライダ１１の振動振幅に比べ
て格段に大きいことから、該圧電検出素子１２からの信
号出力値は従来のものに比べて極めて大きな値となり、
磁気ディスク媒体上の微小突起の存在の検出は勿論のこ
と、該微小突起の数や大きさも正確に検出し得るなど、
検出感度が向上する。Since this amplitude is much larger than the vibration amplitude of the floating head slider 11, the signal output value from the piezoelectric detection element 12 is extremely large compared to the conventional one.
It is possible to not only detect the presence of microprotrusions on a magnetic disk medium, but also accurately detect the number and size of the microprotrusions.
Detection sensitivity is improved.
尚、圧電検出素子１２を片持ち状の配設構成とした場合
、回転中の磁気ディスク媒体上に空気膜を介して当該ヘ
ッドタッチ検出用スライダが浮上した状態で振動すると
、片持ち支持の圧電検出素子１２も振動して誤った検出
信号を出力する心配があるが、かかる圧電検出素子１２
の共振周波数を、該ヘッドタッチ検出用スライダの空気
膜共振周波数（通常は１０〜２０ＫＨｚ）よりも十分高
い共振周波数とすることにより、その心配は解消する。Note that when the piezoelectric detection element 12 is arranged in a cantilevered configuration, when the head touch detection slider vibrates while floating above the rotating magnetic disk medium through an air film, the cantilevered piezoelectric There is a risk that the detection element 12 may also vibrate and output an erroneous detection signal, but such a piezoelectric detection element 12
This concern can be resolved by setting the resonance frequency of the head touch detection slider to a resonance frequency that is sufficiently higher than the air film resonance frequency (usually 10 to 20 KHz) of the head touch detection slider.
また空気膜共振周波数よりも十分高い周波数の振動成分
は、スライダが磁気ディスク媒体に接触しない限り極め
て微弱である。Furthermore, vibration components with a frequency sufficiently higher than the air film resonance frequency are extremely weak unless the slider contacts the magnetic disk medium.
以上の説明から明らかなように、本発明に係るヘッドタ
ッチ検出用スライダによれば、圧電検出素子１２が片持
ち支持構造であるがために、磁気ディスク媒体上の微小
突起に接触した際の圧電検出素子１２からの信号出力値
が従来のものに比べて極めて大きな値となり、検出感度
が向上する。As is clear from the above description, according to the head touch detection slider according to the present invention, since the piezoelectric detection element 12 has a cantilever support structure, the piezoelectric detection element 12 generates a piezoelectric wave when it comes into contact with a minute protrusion on a magnetic disk medium. The signal output value from the detection element 12 becomes an extremely large value compared to the conventional one, and detection sensitivity is improved.
従って、磁気ディスク媒体上の微小突起の存在の検出は
勿論のこと、該微小突起の数や大きさも正確に検出する
ことが可能となる等、実用上価れた効果を奏する。Therefore, not only the presence of minute protrusions on the magnetic disk medium can be detected, but also the number and size of the minute protrusions can be accurately detected, and other practical effects are achieved.
第１図は本発明に係るヘッドタッチ検出用スライダの一
実施例を示す概略側面図、
第２図は従来のヘッドタッチ検出用スライダを説明する
ための概略側面図である。
第１図において、
１１は浮動形ヘッドスライダ、工２は圧電検出素子、２
１は片持ち用絶縁材をそれぞれ示す。FIG. 1 is a schematic side view showing an embodiment of a head touch detection slider according to the present invention, and FIG. 2 is a schematic side view illustrating a conventional head touch detection slider. In Fig. 1, 11 is a floating head slider, 2 is a piezoelectric detection element, 2
1 shows the insulating material for cantilever use.
Claims (2)
（１１）と回転中の磁気ディスク媒体との異常接触を検
出する圧電検出素子（１２）を、絶縁材（２１）を介し
て片持ち状に付設してなることを特徴とするヘッドタッ
チ検出用スライダ。(1) A piezoelectric detection element (12) for detecting abnormal contact between the slider (11) and a rotating magnetic disk medium is placed on the floating head slider (11) in a cantilevered manner via an insulating material (21). A head touch detection slider characterized in that it is attached in a shape.
形ヘッドスライダ（１１）の空気膜共振周波数よりも十
分高い周波数に設定してなることを特徴とする特許請求
の範囲第（１）項に記載したヘッドタッチ検出用スライ
ダ。(2) Claim (1) characterized in that the resonance frequency of the piezoelectric detection element (12) is set to a sufficiently higher frequency than the air film resonance frequency of the floating head slider (11). Head touch detection slider described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5968686A JPS62217477A (en) | 1986-03-17 | 1986-03-17 | Slider for head current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5968686A JPS62217477A (en) | 1986-03-17 | 1986-03-17 | Slider for head current detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62217477A true JPS62217477A (en) | 1987-09-24 |
Family
ID=13120334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5968686A Pending JPS62217477A (en) | 1986-03-17 | 1986-03-17 | Slider for head current detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62217477A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090262460A1 (en) * | 2005-04-27 | 2009-10-22 | Seagate Technology Llc | Head assembly having a sensing element |
| JP2012104210A (en) * | 2010-10-12 | 2012-05-31 | Nitto Denko Corp | Suspension substrate with circuit and method for manufacturing the same |
-
1986
- 1986-03-17 JP JP5968686A patent/JPS62217477A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090262460A1 (en) * | 2005-04-27 | 2009-10-22 | Seagate Technology Llc | Head assembly having a sensing element |
| US8310779B2 (en) * | 2005-04-27 | 2012-11-13 | Seagate Technology Llc | Head assembly having a sensing element |
| US8837075B2 (en) | 2005-04-27 | 2014-09-16 | Seagate Technology Llc | Head assembly with head-media spacing control |
| JP2012104210A (en) * | 2010-10-12 | 2012-05-31 | Nitto Denko Corp | Suspension substrate with circuit and method for manufacturing the same |
| JP2015187906A (en) * | 2010-10-12 | 2015-10-29 | 日東電工株式会社 | Suspension substrate with circuit and method for manufacturing the same |
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